In the water: Winner - alligator
Out of the water: Winner - gorilla
Definitely not.
A gorilla isn't a predator, so their first instinct is to get away from one such as a crocodile. It also has no useful weapons to kill a croc with. Even leopards hunt gorillas.
Could? Yes, it's possible since they're strong animals and smart. But the possibility of them meeting up with one and trying it is pretty slim....to none.
